Squid configuration directive url_rewrite_children
Available in: v7 v6 v5 v4 3.5 3.4 3.3 3.2 2.7 3.1 3.0 2.6
For older versions than v4 see the linked pages above
Configuration Details:
Option Name: | url_rewrite_children |
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Replaces: | redirect_children |
Requires: | |
Default Value: | url_rewrite_children 20 startup=0 idle=1 concurrency=0 |
Suggested Config: |
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Specifies the maximum number of redirector processes that Squid may spawn (numberofchildren) and several related options. Using too few of these helper processes (a.k.a. "helpers") creates request queues. Using too many helpers wastes your system resources. Usage: numberofchildren [option]... The startup= and idle= options allow some measure of skew in your tuning. startup= Sets a minimum of how many processes are to be spawned when Squid starts or reconfigures. When set to zero the first request will cause spawning of the first child process to handle it. Starting too few will cause an initial slowdown in traffic as Squid attempts to simultaneously spawn enough processes to cope. idle= Sets a minimum of how many processes Squid is to try and keep available at all times. When traffic begins to rise above what the existing processes can handle this many more will be spawned up to the maximum configured. A minimum setting of 1 is required. concurrency= The number of requests each redirector helper can handle in parallel. Defaults to 0 which indicates the redirector is a old-style single threaded redirector. When this directive is set to a value >= 1 then the protocol used to communicate with the helper is modified to include an ID in front of the request/response. The ID from the request must be echoed back with the response to that request. queue-size=N Sets the maximum number of queued requests. A request is queued when no existing child can accept it due to concurrency limit and no new child can be started due to numberofchildren limit. The default maximum is zero if url_rewrite_bypass is enabled and 2*numberofchildren otherwise. If the queued requests exceed queue size and redirector_bypass configuration option is set, then redirector is bypassed. Otherwise, Squid is allowed to temporarily exceed the configured maximum, marking the affected helper as "overloaded". If the helper overload lasts more than 3 minutes, the action prescribed by the on-persistent-overload option applies. on-persistent-overload=action Specifies Squid reaction to a new helper request arriving when the helper has been overloaded for more that 3 minutes already. The number of queued requests determines whether the helper is overloaded (see the queue-size option). Two actions are supported: die Squid worker quits. This is the default behavior. ERR Squid treats the helper request as if it was immediately submitted, and the helper immediately replied with an ERR response. This action has no effect on the already queued and in-progress helper requests. |
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